15343949154221 has 2 divisors, whose sum is σ = 15343949154222. Its totient is φ = 15343949154220.

The previous prime is 15343949154143. The next prime is 15343949154299. The reversal of 15343949154221 is 12245194934351.

It is a balanced prime because it is at equal distance from previous prime (15343949154143) and next prime (15343949154299).

It can be written as a sum of positive squares in only one way, i.e., 11394742872100 + 3949206282121 = 3375610^2 + 1987261^2 .

It is a cyclic number.

It is not a de Polignac number, because 15343949154221 - 2³⁸ = 15069071247277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15343949150221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7671974577110 + 7671974577111.

It is an arithmetic number, because the mean of its divisors is an integer number (7671974577111).

Almost surely, 2^{15343949154221} is an apocalyptic number.

It is an amenable number.

15343949154221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15343949154221 is an equidigital number, since it uses as much as digits as its factorization.

15343949154221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 53.

The spelling of 15343949154221 in words is "fifteen trillion, three hundred forty-three billion, nine hundred forty-nine million, one hundred fifty-four thousand, two hundred twenty-one".